I can see that point. There is also something odd about what shootings get publicized and which don't. Some shooters, seem to be getting more media attention than others.
Is it the manifestos or maybe the number of victims? I remember the Congressional baseball shooting, but I think there was no manifesto so it wasn't talked about as much, even though it involved members of Congress. The Christchurch one was publicized and was very visible, and there was a manifesto. The youtube shooter was a strange case. Given what media likes to do, I would have expected that one to be front page news for a long time since it had a manifesto in her videos and it involved a major tech company. However, it disappeared from the news cycle relatively quickly.
Now, I would rather they all not be publicized as much. There needs to be legislative action about guns, what resources, especially mental health, are available, etc. But, it is probably better if that is handled after some time and not in the immediate aftermath of the tragedy.